My Blue Jelly/Velvet/Rili are berried LOL. I have 3 very nice females with yellow eggs!
I believe you can get the deeper blue color by just breeding the best colored blue rili you have without any red. Same as the other types of shrimps that have been developed, just cull the ones that don't show enough color and keep breeding, each generation should be deeper blue than the last.
I did this with my Snow white crystals and now have extreme whites each time!